Abstract

Efficient sum-frequency generation in epitaxial GaAs∕AlGaAs waveguides is reported. Phase matching is achieved for type II nonlinear interaction using Bragg reflection waveguides. Continuous-wave signal and pump in 1550nm wavelength window were used for upconversion of photons to the 775nm region. For a pump and signal with powers of 0.69mW and 0.35mW, sum-frequency power of 35nW was measured. The normalized conversion efficiency was estimated to be 298%W−1cm−2 in a device with a length of 2.2mm. The bandwidth of the process was found to exceed 60nm.

SF power as a function of signal wavelength obtained (a) experimentally and (b) numerically with αi=5.0cm−1. The simulated curves are normalized to the measured peak SF power to facilitate the comparison between the two models.

SF power as a function of pump wavelength. Squares are the measured data while the solid-line is a smoothed fit to remove cavity resonance effect. The pump wavelength range limited the tunability on the long wavelength side.